AT26DF321-S3U ATMEL [ATMEL Corporation], AT26DF321-S3U Datasheet - Page 3

• Manufacturer Part Number: AT26DF321-S3U
• Description: 32-megabit 2.7-volt Only Serial Firmware DataFlash Memory
• Manufacturer: ATMEL [ATMEL Corporation]

3. Block Diagram
4. Memory Array
3633C–DFLASH–08/06
To provide the greatest flexibility, the memory array of the AT26DF321 can be erased in four lev-
els of granularity including a full chip erase. In addition, the array has been divided into physical
sectors of uniform size, of which each sector can be individually protected from program and
erase operations. The size of the physical sectors is optimized for both code and data storage
applications, allowing both code and data segments to reside in their own isolated
regions.
down of each physical sector.
SCK
Figure 2-1.
WP
SO
CS
SI
Figure 4-1 on page 4
GND
WP
CS
SO
INTERFACE
CONTROL
8-SOIC Top View
LOGIC
AND
1
2
3
4
8
7
6
5
illustrates the breakdown of each erase level as well as the break-
VCC
NC
SCK
SI
PROTECTION LOGIC
CONTROL AND
AT26DF321 [Preliminary]
X-DECODER
Y-DECODER
Figure 2-2.
VCC
NC
NC
NC
NC
NC
SO
CS
16-SOIC Top View
1
2
3
4
5
6
7
8
AND LATCHES
I/O BUFFERS
MEMORY
ARRAY
16
15
14
13
12
11
10
Y-GATING
FLASH
9
DATA BUFFER
SCK
SI
NC
NC
NC
NC
GND
WP
SRAM
3